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looks like her farher is some of Aperture Employers, because there is Chell's stand in 'Bring Your Daughter to Work' section

Also on that display is a drawing of a cup with the words 'special ingredient from Dad's work' under it, implying that was indeed Chell's father that brought her to work, and also provided an ingredient that resulted in the crazy growth of the potato!

There has been speculation that Cave Johnson and Caroline are Chell's parents, but there is no concrete evidence to support this.

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